Thornton Oakley (1881-1953) was an illustrator and writer for
periodicals, including Scribner's, Century, Collier’s, and Harper’s
Monthly. Oakley gave lectures at the Art Institute of Chicago, the
Metropolitan Museum of Art, and the Curtis Institute. During World War I
lithographs of his patriotic drawings of war work at the Hog Island
Shipyard, Pennsylvania, were distributed by the United States
government. During World War II he did three sets of pictures of the war
effort for the National Geographic in 1941, 1943, and 1945. After the
war he was commissioned to paint industrial subjects for the
Pennsylvania Railroad, the Philadelphia Electric Company, Sun Oil, and
other industries.

Frank Earle Schoonover (1877 - 1972) was an American illustrator and a
prolific contributor to books and magazines during the early twentieth
century, the so-called "Golden Age of Illustration", he illustrated
stories as diverse as Clarence Mulford's, Hopalong Cassidy stories and
Edgar Rice Burroughs’s